Hi dthourn,
Welcome to the madhouse
Having had a chat with Jason at Birmingham it would seem that they alternate between Pigs and Sheep on the set list, the show is fantastic and very polished now, although it does seem that some of the audience don't seem to recognise some of the wall material which I find amazing.
I also mentioned to Jason that they played Echoes at some shows a couple of years ago and wondered why it had been dropped, he said that you could see people getting up to goto the bar during the song >

so they drooped it, the same thing happened when they played Animals, true Floyd fans love this album(me for one) but someone who has only heard DSOTM will be off to the bar >

Animals was dropped and replaced by either DSOTM or WYWH, I was lucky and got to see the Aussie play both.
I think you are going to throughly enjoy the show ;D, I'm the same as bigdog as in the fact that I have followed the Aussies for 10 years now and have enjoyed every second of their shows, whether it be in a small leisure centre(as of 10 years ago) or a large arena (present)their shows are very enjoyable, at Sheffield Arena I closed my eyes a couple of times and just listened, try it and you will see what I mean. ;D